Save yourself from coding long validations for your web page forms. Here is a simple, powerful client side javascript form validation code. Using this code, you can do the common form validations in a Free Download

Virto Ajax SharePoint List Form Extender brings you one of the best combination that based Web Part allowing for quick and simple customizing SharePoint list forms for creating, editing and viewing list items. Free Download

Shetab Windows Live Authentication for SharePoint allows Windows Live ID users sign-in to your SharePoint site like traditional form login. It is standard Authentication Provider for SharePoint Free Download